/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseGizmos/CombinedTransformGizmo.h
Repositions the gizmo without issuing undo/redo changes, triggering callbacks, or moving any components. Useful for resetting the gizmo to a new location without it being viewed as a gizmo manipulation.
void ReinitializeGizmoTransform ( const FTransform & NewTransform, bool bKeepGizmoUnscaled )